valkey appears to be the largest open source fork of redis that was forked just before their transition to the new source available licenses.
One notable thing missing from the readme is how to run with docker, which I saw in the valkey-py docs.
docker run -p 6379:6379 -it valkey/valkey:latest
You can install the python library with
python -m venv .venv
. ./.venv/bin/activate
pip install "valkey[libvalkey]"